الفهرس 
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Abstract
Nowadays, the use of geosynthetics as reinforcement technique is widely used instead of the traditional techniques to solve many problems in geotechnical engineering practice. One of the most potential applications of geosynthetics is in transportation infrastructures; paved and unpaved roads, where the road section is subjected to cyclic loading. the importance of this technique arises from the ability of geosynthetics to provide tensile reinforcement throught frictional interaction with base course materials. Unpaved roads consist of a layer of course aggregate laid directly over the original subgrade soil. this type od roads is characterized by its low volume of traffic with large deformation as it serve as access roads. when a vertical load from a vehicle is applied to an unpaved road system, horizontal and vertical stresses on the surface of the subgrade which reduce the bearing capacity of the depending on its type and the interface friction properties. the primary aim of the study was to investigate the performance of a type of geogird (CE131) and other types manufactured bt netlon ltd, in al0shrouk factory of synthetic fibers industry. The main objective of this research is to investigate the effect of geogrid inclusion on the behavior of the unpaved road under cyclic loading through laboratory model testinh program and finite element analysis for two kinds of subgrade soils. A series of twenty two model tests were performed on soft clay subgrade, and twenty two model tests were performed on sand subgrade. the laboratory model consist of a rigid square tank of 1500 mm width and 900 mm depth, and a gydraulic loading machine applying cyclic load on a circular rigid plate of 200 mm depth, and hydraulic loading machinr applying cyclic load on a circular rigid plate of 200 mm diameter. the tests were performed to quantify and evaluate the structural contribution of netlon geogrid reinforcement to road construction where the following variables will be investigated: aggregate base thickness: aperture size of the gird; geogird tensile strength; number of geogird layers; and geogird location.